Lifting-jack



W. 'T. WALKER.

LIFUNG JACK. Y APPLICATION FILED SEPT. 5, i919.

Patented Mar. 16, 1920.

.III

w. T. WALKER.

LIFTING JACK.

APPLICATIONFILED SEPT. 5|

Y Patented Mar.16,1920.

2 SHEETS-SHEET 2.

fwILLAI-m fr. WALKER, oF RACINE, .vsrIsrflloNsIn.A

Tanza-whom#mag/Comm; y

` a citizen fof the United Statesyresidin' 'ate' Racine', 1in the rcountyf-of 'Racine-and' tate- 'of Wisconsin, have inventedfcertain new vand useflc Improvements ina- Liftinglacks, off? which zthe following is a specification;

quickly liftin y an automobile -fto' change .'tlie tires,--the rac l("v'bar Vof `the jackl 4being adjusted-in thestandard sovtllat the effective `length Aof these two members y"will be greater `than *the distance between f-theiaxle :and-they l ground "inaking-it-ne'cessary to set `thel zj ack 'at'anjanglefiinderthe axle ofthe` vehicle-,#the

liftingfoperation`being performedfby push-Y 1 ing l:the relaitively `long handle vdownwardly to-tlieground which causes the base of-"tlie fjack 'to Ymovelpastj center-under thepaxl'ej' wherebygthe load :is sustained byxthe lstand- Y ard: and the "handle o'ffthe j ackeach acting -as a brace for the other. Since 'acks of-'lthis `typel are limited to a' single Vlifting move'- ment by the handle, 'it :is'es'sential thatA the rackv bar be jpopely adjusted v4in' the stands* `flrd Vpreparatory to the 'lifting*operationA 1If the rack bar is not high enough inthestand-c, ard, the load willy not "be lraised :high enjogh and-if the rack 1bar istoo "high in `the fstand-y v ard; lthe V'anglefof action :will be'too' great to overcome. Y

The `primary "obj ect E ofv my Ainvention;isfto provide'l anim'proved 41jack of this ygeneral type of simple and 4Acoirnpacl', --eonstruction having means fwherebythe rack lbarfm'ayfbe quickly raised withv respect "to'ith'e standard Yof the jack `to: just the lproperheight"preparatory'rtothe lifting'operationlw y -f 1 Themvention jccnsists infthe=--iioveland Y.

- improved `eonstructions, 'arrangements Y,and

devices vrto be-"lhereinafteri` described fand claimed fo'r carrying ont thc.*above`stated Y object and suehjother''ineidental objects as `wi1llgappear from the following Vdescription of a'preferred embodimentoftheyinvention which is illustrated in the accompanying Figure 1 is 1avertical sectionalfview cfa jack embodying the principles of endsfthereof being yformeil'with the internal .-threadslflA which are adapted toibe'ex'iga'gedi lmemberl is' provided with internal threads y. inve 'with r1the ftee'th of tion;

`aten-ted Mar.` 16, 1920; '.np'plieatiqn 1mea'sapteniterf5, 1919; 'seriainorlamgsovsl Fig.-4is arfside elevational view ofthe V g jack-in position lunder'theaXle vofthe vehicle aratory to the lifting '-movemen@ and showinglthe same sustaining a load. 1

wigu'is anelev-ational'view ofz'the )jack I Y Like charaetersfof .reference Ldesig'g'natelike y parts in-theseveral vie-ws. l, l

e The jack comprises a "tubular --standard "1'0 ofthe Ystandard preferably comprises aT- shaped'cjasting for pipe lfitting the opposite by AAthe threads *formed on Ithe inner ends off' mounted lon rollers `l"1` andiprovided withan Yopierating handle '12. V"The basemember 13 theme-'Shafts 15 on whichthe/rollers 1i 1 are 'mounted lThe vertical bore 516 inthe 17 adjacent *lits upperend which :are adapted f t0y engage the 4external threads :formed onf' I guidingmember k2'() lis screwfthreaded vinto the opposite :end of the member r195. The` f rack bai'1 2l is 'guided in "the standard VVVthus f formed-doy the *bushing 18 and the 'member 20. i The *member "19 "is, Aformed ywithV a lati erally extending'boss Q2 Apreferably `inter-` shaped*castingor pipe'tting11`9"has-screw A i 'threaded engagement `with "ftheA bushing 18, 30

nally screw {threadedior `the reception 'oftlief Y handle'fmemberflQ. yThe upper `end Vof the'v p rack bar is Ascrew threaded intofthe cap 23. 1

'Afco'llar 24, fisplaced v over the member' '20 wli-ich rests against-the top yof the ymember l179.*7'l`he collar is prevented from turning by the -set screw 25, the inner end of whichprol jects into` al vertical guide'way 26' formefdfin .from turnin screw serves'a'lsofas astop to `limitthe up- 24'- 'is Vformed -w'ith two Alaterally `emiending lugs 27 between which a? pawl 2'8ispivotally *mounted lon. 'thepin-"29.Y The upper fend 'of 'Y thepawl 28 `projects through a s106529* formed Yin lthe member 20 Aand is adapted Ito gthepawjl normally being hele V'in engagement f 4the rack gba'r vbythe a sa Thel bar is preferably .-raisedby a spring 3l" which is'pla'ced inside'the rack .bar the lower end of the spring seating againstV the bottom of the base member 13 and the upper end of the spring bearingV against the under side of the cap 23. The pawl'28is preferably formed with a hooked portion which is adapted to hookover a pin on the cap 23, this arrangement being for the purpose of holding the rack bar within the'.

standard when that is desirable. The hook 32 may be pulled out of engagement with the pin `33 by pulling the chain 34, this chain i being .secured to the outer end of thehanf chain 34 is` then pulled which disengages the hook 32 from the pin 33 and the rack bar is lifted upwardly into engagement 1 with .the axle of the vehicleby the' action y of; the spring 31 shown in dotted lines infFig.` 4. The chaininay vthen be released and thepawl 28 willbe forced into engagement with the teeth onythe rackbar -by the a0` springl v`30 thereby 'preventing the rack bar from `slipping j downwardly into the standard.- This `preparatory adjustment `of the rack bar with respect tothe standard `per-` mits-the operatorio-place the jack at the proper angle underthe axle of the vehicle and whatever lost motion there may be between the cap and the axle is taken up by raising the rack bar. `The handle of the 'jack is then pushed downwardly until it touches the ground which movement of the handlecauses the jack to pass beyond the centerA or vertical position. By this move- `ment the load is lifted and is sustained byA the standard and the handle of the jack each of these members acting as a brace for the other, Fig. 5 illustrates the position of the jack when sustaining a load. The handle'is preferably bent as shown in Fig.4 4 so as to moreeiiectively engage the ground. I

While I have shown and described my 1nventionfas applied to a jackinwhich `the rack bar is raised by a spring upon releas-V ing the holding member I do not intend to limit theinvention in this respect as it will `be obvious that the rack bar maybe raised' in other ways, the spring arrangement be-l ingthe preferred one. It will `also be obvious that various modifications may be made in thei device without departing from the `principles of the-invention, I do not intend, therefore,`tolimit.the invention tothe constructiong; .arrangements and devices shovvnand-described except only in so fai-' r ascertain ofthe `appended claims are specifi.

lsally so limited. Y

IC1aim= y v d 1. A lifting jack comprisingwa tubular standard, a handle rigidly associated with said standard-,Qa tubular member slidably mounted .in .said standard, a compression springy within and adapted to raise said member with respect to the standard, means ard against V the -actionof "the spring, and means to prevent said member from slipping adapted to retain said member in-the'standback into the standard after being raised relative thereto, whereby the, jack may be positioned` obliquely under, the load, said means. released v4and saidimember, through the infuenetSa-id spring, movedntq engagement with the loadpreparatory to the liftingoperation. V Y

A lift'ng Jack Vcomprising a tubular standard, a handle rigidly.'associated` with,

said standard, a tubular rack bar slidab-ly Vmounted in said" standard, a compression` spring withinand adapted `to raise said rack bar :with respect to the standard, means ada-ptedto retain -said rack bar in the standard againstgtlieactlon of the spring, and a pawl pivoted to the standard and adapted to prevent the rack bar from slipping` back` `into the Vstandard afterbeing raised relative thereto, whereby the jack may bepositioned obliquely under the load, said rmeans released, and said rack bar, through the influence of said spring,moved into engagement with the load preparatory to the lifting 0p.- eration.

V3. A lifting jack `comprising a tubular standard, Ya roller 4pivotallyv attached to the ase. of the standard, a ,handle rigidly as- 'Y sociated with said standard, a tubular'rack bar slidably mounted `in said standard, a

compression spring ,within and adapted to raise said rack bar with; respect tothe stand-l i and adap'tedto retain said rack barin the standard against the action `of lthe spring, and a pawl pivoted to the ,standard Vand adaptedto engage the teeth on said rack bar to prevent the rack bar from slipping'back ard, a'hook member ypivoted to said standard into y the standard after beingraised frelative thereto, ,whereby the jack maybe positioned obliquely underthelo'ad, said ,hook

member disengaged from saidracl; bar, .and said rack bar, ,through the'influence of said, spring, 'moved into engagement with the y load preparatory Yto the lifting operation.-

4. A lifting jack comprisingVv a tubular tting disposed so that its straight bore i2o. vstandard consist-ing of a T-shaped ,pipe d fitting as a base, a second ,T-shaped pipe alines with the angle bore of vthe tirst-men- L tioned fitting, aniember connecting` the two ittings,- a handle rigidly secured inthe 1 angle bore ofthe second-mentioned `fitting.

a tubular rack'barslidably mountedin said standard, a compression.springwithin and adapted to raise fthe rackilbar, means to Vre- (gliA A'tain the rack bar Within the standard against the action of the spring, and means to prevent backwardmovement of the rack bar in the standard'after it has been raised therein upon `release of. saidl first-mentioned means. 'y Y 5. A lifting jack comprising a tubular Vstandard consisting of'fa T-shaped pipe itting as a base, stub shafts secured in the opposite endsof the straight bore of theV itting,*rollers on said shafts, a second T- shaped pipe fitting disposed sothat its straight bore alines with the angle'bore of astandard, a handle rigidly associated WithV said standard, an tubular raclcbar slidablyl mounted in said standard, a cap securedtov 30' bar, means to retain the rack bar Within the standard against the action of-the spring, and means to prevent backward movement of the rack ba1"inthe standard after it has been raised thereinvupon release of said 25 first-mentioned means. Y

6. A lifting jack comprising a tubular the top ofk said rack bar, avrcompression the base of the standard and the cap on said -rack bar,a'ho0k member Vpiv'oted on said standard adapted to engage and retain said rack bar in the standard'against the action ardl and adapted vto engage the teeth ofsaid rack bar to v,prevent backward movement thereof in the standard, and a member as.

sociated with saidk handlefor disengaging saidv hook from said rack bar.

l 7 A lifting jack comprising Aa tubular standard, a roller `attached to the base of the standard, a handle rigidly' associated with said standard, a tubular rack bar slidf ably mounted inv said standard, a cap se- 'cured [to vthe top of said rack bar, a compressionspring in said rack bar. interposed spring in said rack bar interposed between of the spring. a paWl pivoted to said standf between the base of the standard and said Y cap, "a hook member pivoted on said standretain itin the standard against the action `V ard and adapted to engage the rack bar and of saidspring, means associated With said,

handle for disengaging said hook from said rack bar, and a pawl formed integrally with said hook member ,and adapted toenga'ge the teeth on said rack to prevent back- Ward movement thereof in the standard. i

WILLARD T. VWALKER. 

